Mary "Jacky" Faber is a fictional character from the book series "Bloody Jack," written by L.A. Meyer. Set in the early 19th century, she is a young girl who disguises herself as a boy to join a British warship, seeking adventure and a better life. Throughout the series, Jacky faces various challenges and adventures at sea, showcasing her bravery and resourcefulness. The character is known for her strong spirit and determination, making her a beloved figure in young adult literature. The series highlights themes of identity, courage, and the quest for freedom.